Just wondering what everyone uses for rust treatment before coating with underseal. I'm treating the worst of the rust with Deox Gel which is working great. Got some Hammerite Underbody seal - anyone used it before?

Thanks

can of worms, everyone will say something different and recommend a range of products from £1 to £100 and for every application inbetween

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Zinc primer is very effective and a proven technology. I took a rear disc back plate off my car last week that had been zinc primed and then painted silver 3-4 years ago and there was no trace of rust on it.

Whichever product you use it is a faff getting the rust off. I found Deox gel good but needed 2-3 applications in some places. If there is scaly rust you need to chisel that off first before putting the Deox on there.

Once you have the rust off you need to think about how you will protect the metal. Underseal can make it difficult to see what is going on underneath it and if any rust is not completely removed it will keep rusting under the underseal. I wouldn't apply underseal over bare metal, I'd protect it first.

Have a look at some of the project threads on here and you will see what people have done.

If you need any welding done you need to apply your chosen protective coating to both sides of the metal otherwise it will rust from the inside!

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